Sierra 1500 4WD V8-5.3L VIN B (2005)
Fuel Injector: Description and Operation
Fuel System (Cab Chassis)
FUEL INJECTORS
The Multec 2 fuel injector assembly is a solenoid device, controlled by the powertrain control module (PCM), that meters pressurized fuel to a single
engine cylinder. The PCM energizes the high-impedance (12.0 ohms) injector solenoid (2) to open a normally closed ball valve (3). This allows fuel to
flow into the top of the injector, past the ball valve, and through a director plate at the injector outlet. The director plate has 2 machined holes that
control the fuel flow, generating a spray of finely atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve, causing it to
become further atomized and vaporized before entering the combustion chamber. This fine atomization improves fuel economy and emissions.
